There's a big difference between internal work and external work, where that discussion can matter a lot in antagonistic disputes (in court or outside of it) over whether a particular change (and its consequences) was requested or not, and if so, by whom and when.

In a perfect world yes. But the majority of JIRA stories that I’ve come across often don’t contain complete information. The best, well disciplined folks recognize that they will inevitably forget details and write careful summaries, most people write a few bullet point to satisfy the acceptance criteria for the story.

Slack conversations often contain more data. It’s also easier for me to follow a human conversation than a poorly written summary with many missing details.